JPH0752101A - Method and device for sawing - Google Patents

Abstract

PURPOSE:To permit sawing as efficiently as possible by a method wherein a log sending speed is changed in accordance with a cutting length, which is changed in accordance with the configuration of the log. CONSTITUTION:The whole configuration of a log 1, such as the length of the log, the change of sectional configuration along the axial direction of the same, curvature, twisting and the like in the axial direction of the same and the like, are measured based on the outputs of sensors 21, 22, 31-34, 41-44, 51-54 whereby the measured data are inputted into an operating device 6. In the operating device 6, the planning of cutting of the log and the method of sheeting are determined by a predetermined program based on the results of measurements and, further, cutting lengths upon cutting the log based on the determined plan of cutting and method of sheeting are operated across the whole length of the log. The results of operations are inputted into a control device 7 while the control device 7 controls the driving mechanism of a sawing device 8 based on the input so that the feeding speed V of the sawing device 8 becomes the simple reducing function of the cutting length. According to this method, cutting resistance upon sawing is kept in constant substantially whereby the efficiency of sawing is improved remarkably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for sawing logs as efficiently as possible.

[0002]

2. Description of the Related Art Conventionally, when a log is lumbered by taking a predetermined amount of wood and stepping, the feeding speed is constant regardless of the change in the cutting length of the lumber due to the saw teeth. However, since the cutting resistance of the sawtooth changes according to the cutting length, it is possible to increase the feeding speed when the cutting length is short, and therefore the feeding speed is constant regardless of the change in cutting resistance. Is inefficient.

[0003]

SUMMARY OF THE INVENTION The present invention has been made from the above viewpoint, and its purpose is to:
It is an object of the present invention to provide a method and a device that can perform lumbering as efficiently as possible by changing the feeding speed in accordance with the cutting length that changes depending on the shape of the log.

[0004]

[Means for Solving the Problems] The above objects are to measure a shape of a log to be lumbered, to determine a tree-picking and stepping method based on the measurement result, and to determine the tree-cutting and stepping. Cutting length L when sawing by the method
Is calculated over the entire length of the log, and the step of feeding the lumber while controlling the feeding speed as a monotonically decreasing function of the cutting length L is performed.

Further, the lumbering method is an apparatus for measuring the shape of a log to be lumbered, and a tree-taking and stepping method is determined based on the measurement result, and when the timber-taking and stepping method is determined. An arithmetic unit that calculates the cutting length L of the log over the entire length of the log, and the feeding speed of the feeding device is the cutting length L
And a control device that controls as a monotonically decreasing function of.

[0006]

With the above-described structure, even in the case of one log lumber mill, the feeding speed is automatically reduced in the portion where the cutting length L is long, and the feeding speed is increased in the portion where the cutting length L is short. However, since the lumbering is performed, the working efficiency is remarkably improved as compared with the case where the lumbering is always performed at a constant feeding speed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory view showing the principle of the lumbering method according to the present invention,
FIG. 2 is an explanatory view showing a state of measuring the shape of a log in the lumbering method according to the present invention, and FIG. 3 is an explanatory view showing one embodiment of an apparatus for lumbering by the method of the present invention using the measurement result. is there.

In FIG. 1, 1 is a log to be sawn, and 1a and 1b are both end faces thereof. The log 1 has a cross-sectional area perpendicular to the axis that gradually decreases from the right end face 1a to the left end face 1b, and the cross-sectional shape also gradually changes, and there is also an axial bend and twist. Therefore, when grinding the outside in the radial direction, the cutting length is the right end face 1
It is La ₁ near a, but becomes gradually smaller toward the left side in the figure, and becomes La ₂ (where La ₁ > La ₂ ) near the left end face 1b. Similarly, when grinding the inside more than that, the cutting length is Lb ₁ near the right end face 1a, but gradually decreases toward the left side in the drawing, and Lb ₁ near the left end face 1b.
₂ (However, Lb ₁ > Lb ₂ , Lb ₁ > La ₁ , Lb ₂ >
La ₂ ). When the cutting length is long, the cutting resistance is large, and when the cutting length is short, the cutting resistance is small.

Therefore, according to the method of the present invention, the cutting length is
When L is long, feeding speed V is slowed and cutting length L is short.
In this case, the feeding speed V is controlled to be high and the cutting resistance is
While maintaining the resistance substantially constant, in other words, cutting per unit time
The lumber is made while keeping the area approximately constant. Immediately
Then, in the example shown in FIG. 1, when grinding the outside in the radial direction
The cutting speed near the right end face 1a of₁, Left edge
The cutting speed near the surface 1b is Va₂, Radially inward
The cutting speed near the right end face 1a when grinding is V
b₁, The cutting speed near the left end face 1b is Vb₂Tosu
If so, Va₁<Va₂, Vb₁<Vb₂, Va₁> Vb
₁, Va₂> Vb₂The feeding speed V is controlled so that
It is a thing. More specifically, the cutting area per unit time
(L · V) becomes almost constant, that is, (L · V) ≈
(La₁・ Va₁) ≒ (La₂・ Va₂) ≒ (Lb₁・
Vb ₁) ≒ (Lb₂・ Vb₂) ≈k
While (k is a constant), that is, the feeding speed V is monotonous with the cutting length L
The lumber is milled while controlling so as to have a decreasing function.

An apparatus for carrying out the above lumbering method will be described below with reference to FIGS. 2 and 3. In the figure,
21 and 22 are sensors for measuring the material length x of the log 1, 31
~ 34 are sensors for measuring the outer shape of the right end of the log 1, 4
1 to 44 are sensors for measuring the outer shape of the intermediate portion, 51 to 54
Is a sensor for measuring the outer shape of the right end portion, 6 is an arithmetic unit, and 7
Is a control device, and 8 is a material feeding device.

Sensors 21, 22, 31-34, 41-4
Based on the outputs of 4, 51 to 54, the material length of the log 1, the change in the cross-sectional shape along the axial direction, the overall shape such as the bending and twisting in the axial direction, is measured. input. In the arithmetic unit 6, a wood cutting and stepping method is determined based on the above measurement results by a preset program, and the cutting length L when sawing by the wood cutting and stepping method that is determined is a log. Calculated over the entire length. The calculation result is input to the control device 7, and based on this, the control device 7 drives the feeding device 8 so that the feeding speed V of the feeding device 8 becomes a monotonically decreasing function of the cutting length L. To control. As a result, the cutting resistance during lumbering is kept substantially constant, and the feeding speed V is automatically increased at the portion where the cutting length L is short, so that lumbering is performed.
This will greatly improve the lumbering efficiency.

[0012]

Since the present invention is constructed as described above, according to the present invention, the feeding speed is automatically changed according to the change in the shape of the log, so that the lumber can be produced as efficiently as possible. Is possible.

The structure of the apparatus for carrying out the method of the present invention is not limited to the above embodiment, and those skilled in the art can easily conceive from the above description within the scope of the object of the present invention. It is intended to include all modified embodiments.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the principle of a lumbering method according to the present invention.

FIG. 2 is an explanatory diagram showing a state in which the shape of a log is measured in the lumbering method according to the present invention.

FIG. 3 is an explanatory diagram showing an example of an apparatus for performing lumber by the method of the present invention using the measurement result.

[Explanation of symbols]

 1 Log 21-54 Shape measurement sensor 6 Computing device 7 Control device 8 Feeding device

Claims (2)

[Claims] 1. A step of measuring the shape of a log to be lumbered, a step of determining a tree-taking and stepping method based on the measurement result, and a cutting length L for sawing by the determined tree-taking and stepping method. And calculating the feed rate as a monotonically decreasing function of the cutting length L,
A lumbering method comprising the steps of sending lumber and performing lumbering. 2. A device (21-54) for measuring the shape of a log (1) to be lumbered, and a wood removing and stepping method is determined based on the measurement result,
An arithmetic unit (6) for calculating the cutting length L over the entire length of the log when the lumber is cut according to the determined wood removal and stepping method, and the feeding speed of the feeding device (8) as a monotonically decreasing function of the cutting length L. A sawmill device comprising: a control device (7) for controlling.